jackson@duke.edu

¹ Department of Biology, Nicholas School of the Environment, and Center on Global Change, Duke University, Durham, NC 27708-0338, USA
² Department of Earth System Science, University of California, Irvine, CA 92697, USA
³ Global Carbon Project, CSIRO Marine and Atmospheric Research, GPO Box 3023, Canberra, ACT 2601, Australia
⁴ Department of Civil and Environmental Engineering, Duke University, Durham, NC 27708, USA
⁵ Department of Environmental Science and Management, University of California, Berkeley, CA 94720, USA
⁶ Earth and Sun Systems Laboratory, National Center for Atmospheric Research, Boulder, CO 80305, USA
⁷ Department of Global Ecology, Carnegie Institution, Stanford, CA 94305, USA
⁸ Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907, USA
⁹ Department of Biological Sciences and Merriam-Powell Center for Environmental Research, Northern Arizona University, Flagstaff, AZ 86011, USA
¹⁰ Grupo de Estudios Ambientales-IMASL, Universidad Nacional de San Luis and CONICET, San Luis 5700, Argentina
¹¹ School of Natural Sciences, University of California, Merced, CA 95344, USA
¹² Ecology and Evolutionary Biology, University of California, Irvine, CA 92697, USA
¹³ Author to whom any correspondence should be addressed